;;;;;;; initialization ;;;;;;;

breed [cfirms cfirm]
breed [kfirms kfirm]

kfirms-own [ p A LD D   Q   NW x ]
cfirms-own [ p A LD D S Q N NW I x ]
globals    [ wage Emp L U cpi A.avg C.agg I.agg     mu r ]

to setup
  print "*********************************"
  clear-all

  ; some constants
  set mu 0.3  ; markup rule
  set r 0 ; 0.01  ; interest rate

  ; globals
  set wage 100
  set L 3000 ; labor supply
  set Emp 0
  set U L
  set cpi 100  ; FIXME: article was 1.3
  set A.avg 1
  set C.agg 0
  set I.agg 0

  ; consumption-goods firms
  create-cfirms ncfirms [
    ; for t=0,
    set p wage   ; TEMP
    set A []     ; capital stock productivities
    set LD 0     ; labor demand
    set D 0      ; demand (FIXME: check)
    set S 0
    set Q 0
    set N 0      ; inventory
    set NW NW0  ; net worth  ; ricardo: article 3000
    ;set NW NW * 200 / ncfirms   ; FIXME: para comecar enquanto nao temos todas as firmas a funcionar
    set I 0
    set x 1 / ncfirms ; market share
    set hidden? true
  ]

  ; capital-goods firms
  create-kfirms nkfirms [
    ; for t=0,
    set p wage
    set A 1
    set LD 0
    set D 0
    set Q 0  ; redundant: will always be the same as D
    set NW NW0
    ;set NW NW * 50 / ncfirms   ; FIXME: para comecar enquanto nao temos todas as firmas a funcionar
    set x 1 / nkfirms ; market share
    set hidden? true
  ]

  reset-ticks
end














to-report expected-demand
  report D  ; myopic: same as last time period
end

to-report random-kfirm  ; random using market share as the fdp
  let rnd random-float 1
  let cx 0
  let ret 0
  foreach sort-on [who] kfirms [
    ask ? [
      ; work around: cannot use report inside loop
      if rnd < cx + x and ret = 0 [
        set ret self
      ]
      set cx cx + x
    ]
  ]
  report ret
end

to step1 ; update cfirms
  ask cfirms [
    let .p p
    
    ; some constants
    let ud 0.75  ; desired level of capacity utilization
    let alpha 0.1  ; Trigger rule
    let b 4  ; Payback Period Parameter
    let omega_max 2  ; firms borrow up to a maximum debt/sales ratio

    ; demand expectations
    let De expected-demand

    ; quantity desired to produce
    let Qd max list 0 (De - N)

    ; capital stock
    let K length A

    ; start by producing what we can, then spend the rest in investment
    ; for usage in the next period

    let Deb (- min list 0 NW)
    let can_spend max list 0 ((S * .p * omega_max) + NW - Deb)

    ;;;;;;;;;;;;;;;;;;;; production ;;;;;;;;;;;;;;;;;;;;

    set LD 0
    set Q 0
    let c 0

    if Qd > 0 and not empty? A [
      let avg.A mean A
      set c wage / avg.A
      
      let Qmax floor (can_spend / c)
      set Q min (list Qd Qmax K)  ; K * ud
      set can_spend can_spend - (Q * c)

      set p (1 + mu) * c  ; price: using markup rule
      set LD Q / avg.A    ; labor demand
    ]

    ;;;;;;;;;;;;;;;;;;;; investment ;;;;;;;;;;;;;;;;;;;;

    ; desired stock of capital
    let Kd Qd ; / ud
    let Ktrig K * (1 + alpha)  ; (introducing investment lumpiness)

    ; machine information

    ; choose a firm from which to buy from
    ; use fdp based on market share
    let kseller random-kfirm
    let p* [p] of kseller
    let A* [A] of kseller
    let c* wage / A*

    ; expansion investment
    ; ERROR in the article: Ktrig - K
    let EI 0
    if Kd >= Ktrig [
      set EI min list (Kd - K) floor (can_spend / p*)
    ]
    set can_spend can_spend - (EI * p*)

    ; HACK: dont let it waste all money on investment and have nothing left for production next turn
    ;       which happens at the start
    if Q = 0 [
      set EI EI / 2
    ]

    ; scrap machines
    
    ; A is sorted, so we just have to find the RSpoint
    let RS* 0
    let end? false
    foreach A [
      if not end? [
        let c. wage / ?
        ifelse c. - c* >= p* / b [  ; MODEL change: tive que somar 1 ao denominador
          set end? true
        ][set RS* RS* + 1]
      ]
    ]
    let RI min list (length A - RS*) floor (can_spend / p*)  ; replacement investment
    print (sentence "good up to: " RS* ", total: " length A ", replace: " RI)

    ; total investment
    let I.K EI + RI

    ; scrap old machines from capital stock
    if RI > 0 [
      print sentence "** replace: " RI
      print sentence "old length: " length A
      set A sublist A 0 (length A - RI)
      print sentence "new length: " length A
    ]
    ; buy machines
    set A sort-by > sentence A (n-values I.K [A*])  ; sort: from highest to lowest productivity
    set K length A
    set I I.K * p*

    ; (we can only use this capital in the next period)

;print sentence "    produce " (Q * c)
;print sentence "    invest " (I * p*)


    ;;;;;;;;;;;;;;;;;;;; accounting ;;;;;;;;;;;;;;;;;;;;

    ; ricardo: profits not well-defined in the article (different time periods)
    set NW NW + (S * .p) - (Q * c) - (r * Deb) - I ; stock of liquid asset
;print sentence "NW " NW
;    show sentence "labor demand" LD
  ]
end









to step2 ; update kfirms
  ask kfirms [
    let c wage / A
    set p (1 + mu) * c

    set Q D
    set LD Q / A
    let Deb abs min list 0 NW
    set NW NW + ((p - c) * Q) - (r * Deb)
  ]
end










to-report fitnessfn
    ; constants  ; competitiveness weights
  let omega1 1
  let omega2 1
  let omega3 1
  let omega4 1
  ; ricardo: this last argument criteria affects very much things
  if is-cfirm? self [ report (- omega1 * p) + (- omega2 * (D - S)) ]
  if is-kfirm? self [ report (- omega3 * p) + (omega4 * A) ]
  error "fitness input must be cfirm or kfirm"
end

to adjust-market-share [firms]
  let avg.E mean [
    fitnessfn
  ] of firms

  let sum.x 0
  ask firms [
    let E. fitnessfn
    set x max list 0 (x + x * (0.1 * (E. - avg.E) / avg.E))  ; article: 0.5
    set sum.x sum.x + x
  ]
  ask firms [  ; make sure sum x = 1
    ifelse sum.x = 0 [
      set sum.x 1 / count firms
    ][
    set x x / sum.x
    ]
  ]
end

to step3 ; update consumption-goods market
  adjust-market-share cfirms
end







to step4 ; update capital-goods market
  adjust-market-share kfirms
end








to step5 ; exit and update innovation
  ; constants
  let i1 -0.5  ; Uniform Distribution Support: Lower Bound
  let i2  0.5  ; Uniform Distribution Support: Upper Bound

  ; innovation
  ask kfirms [
    ;let oldA A
    set A max list A (A + random-float (i2 - i1) + i1)
    ;if oldA != A [show sentence "discovery: " A]
  ]

  ; FIXME: these new firms shouldnt be affected by step6 dynamics ..
  ask cfirms [
    if x = 0 [  ; FIXME: Deb>3000
      show (sentence "morri - x: " x " , NW: " NW)
      ;ask one-of cfirms [hatch 1]  ; ricardo: desactivado para ja ..
      die
    ]
  ]
  ask kfirms [
    if x = 0 [  ; FIXME: Deb>3000
      show "morri"
      ;ask one-of kfirms [hatch 1]  ; ricardo: desactivado para ja ..
      die
    ]
  ]
end









to step6 ; macro dynamics
  ; constants
  let nu 0.01  ; Labor Supply Growth Rate
  let psi1 0.75  ; Wage Setting: delta-cpi weight
  let psi2 1     ; Wage Setting: delta-A.avg weight
  let phi 0.1    ; wage share  ; 2005
  ;let phi 0.33    ; wage share  ; 2008
  
  ;set L L * (1 + nu)  ; ricardo: commented out .. was increasing too fast
  let LD.agg sum [LD] of cfirms + sum [LD] of kfirms
  set Emp min list L LD.agg
  
  set C.agg (wage * Emp) + (phi * wage * L)  ; 2005
  ;set C.agg wage * (Emp + (phi * wage * (L - Emp)))  ; 2008
  set I.agg sum [I] of cfirms

  ; ricardo: moved from step3
  ; allocate consumption, according to market share
  ask cfirms [
    set D (C.agg * x) / p
    set S min list D Q
    set N Q - S
  ]
  ; ricardo: moved from step4
  ask kfirms [  ; make sure sum x = 1
    set D (I.agg * x) / p
  ]

  ; wage growth calculation
  set U L - Emp  ; FIXME: not used yet
  let cpi.new sum [p * x] of cfirms
  let A.avg.new sum [A * x] of kfirms

  ; ricardo: article is wrong; should be cpi(t-1)-cpi(t), so that reductions in price increase wages (to adjust for inflation)
  ;set wage wage * (1 + (psi1 * ((cpi.new - cpi) / cpi)))
  ;set wage wage * (1 + (psi1 * ((cpi.new - cpi) / cpi)) + (psi2 * ((A.avg.new - A.avg) / A.avg)))  ; ricardo: commented out .. was increasing too fast
  set cpi cpi.new
  set A.avg A.avg.new
end









to update
  if ticks >= time [ stop ]
  step1
  step2
  step3
  step4
  step5
  step6
  tick
end
@#$#@#$#@
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595
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ticks
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SLIDER
366
29
536
62
ncfirms
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1
1
1
NIL
HORIZONTAL

PLOT
9
10
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193
employment
NIL
NIL
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300.0
0.0
3000.0
true
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"" ""
PENS
"Emp" 1.0 0 -5204280 true "set-plot-y-range 0 round L" "set-plot-y-range 0 round L\nplot Emp"
"L" 1.0 0 -16777216 true "" "plot L"

PLOT
8
203
339
393
aggregate ouput
NIL
NIL
0.0
300.0
0.0
10.0
true
true
"" ""
PENS
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"Y" 1.0 0 -16777216 true "" "plot C.agg + I.agg"

BUTTON
368
125
441
158
NIL
setup
NIL
1
T
OBSERVER
NIL
NIL
NIL
NIL
1

BUTTON
463
125
536
158
go
update
T
1
T
OBSERVER
NIL
NIL
NIL
NIL
1

PLOT
656
135
904
255
market shares
NIL
NIL
0.0
300.0
0.0
1.0
true
true
"ask cfirms [\n  create-temporary-plot-pen (word [who] of self)\n  set-plot-pen-color ((([who] of self) * 10) + 2)\n]" "ask cfirms [\n  set-current-plot-pen (word [who] of self)\n  plot x\n]"
PENS

SLIDER
368
77
536
110
nkfirms
nkfirms
1
50
1
1
1
NIL
HORIZONTAL

PLOT
658
262
904
382
net worth
NIL
NIL
0.0
300.0
0.0
10.0
true
true
"ask cfirms [\n  create-temporary-plot-pen (word [who] of self)\n  set-plot-pen-color ((([who] of self) * 10) + 2)\n]" "ask cfirms [\n  set-current-plot-pen (word [who] of self)\n  plot NW\n]"
PENS

PLOT
7
405
340
575
firms agg variables
NIL
NIL
0.0
300.0
0.0
20.0
true
true
"" ""
PENS
"Inventory" 1.0 0 -987046 true "" "plot sum [N] of cfirms"
"Demand" 1.0 0 -4699768 true "" "plot sum [D] of cfirms"
"Produced" 1.0 0 -2674135 true "" "plot sum [Q] of cfirms"
"Sales" 1.0 0 -955883 true "" "plot sum [S] of cfirms"

MONITOR
354
283
411
328
NIL
Emp
2
1
11

MONITOR
553
294
635
339
NIL
count kfirms
17
1
11

MONITOR
554
343
633
388
NIL
count cfirms
17
1
11

PLOT
796
10
1018
130
cfirms A*
NIL
NIL
0.0
300.0
0.0
5.0
true
true
"ask cfirms [\n  create-temporary-plot-pen (word [who] of self)\n  set-plot-pen-color ((([who] of self) * 10) + 2)\n]" "ask cfirms [\n  set-current-plot-pen (word [who] of self)\n  ifelse empty? A [plot 0] [plot mean A]\n]"
PENS

MONITOR
353
338
410
383
price
sum [p * x] of cfirms
2
1
11

MONITOR
416
339
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NIL
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1
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MONITOR
440
284
526
329
NW biggest
sum [NW] of cfirms with [x = max [x] of cfirms]
0
1
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TEXTBOX
704
527
822
587
TODO:\n* see replicator dynamics (die and breadth)
12
0.0
1

SLIDER
528
178
632
211
NW0
NW0
0
10000
3000
1000
1
NIL
HORIZONTAL

PLOT
565
10
791
130
kfirms A*
NIL
NIL
0.0
300.0
0.0
5.0
true
true
"ask kfirms [\n  create-temporary-plot-pen (word [who] of self)\n  set-plot-pen-color ((([who] of self) * 10) + 2)\n]" "ask kfirms [\n  set-current-plot-pen (word [who] of self)\n  plot A\n]"
PENS

SLIDER
498
225
631
258
time
time
1
10000
10000
1
1
NIL
HORIZONTAL

@#$#@#$#@
## WHAT IS IT?

Business cycle agent-based model based on Dosi et al (2005).

## CREDITS AND REFERENCES

Giovanni Dosi, Giorgio Fagiolo & Andrea Roventini. An Evolutionary Model of Endogenous Business Cycles. Computational Economics, 2005.
@#$#@#$#@
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@#$#@#$#@
NetLogo 5.0.5
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@#$#@#$#@
default
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